What you ask is not possible with the game play of L&S: most "game over" situations are the accumulation of a lot of small decisions, for example let's talk about what we call "showdowns", the moments when girls confront you and you can either form a harem or lose one of them:As I wrote. Create the warnings or restore options as a cheat options. This way you don't have to see them if you don't want to. Then we both get what we want.
Beside that. Please don't twist what I wrote. I never asked for warnings for everything. I asked for warnings when you are about to make a decision that will end a quest line or turn a girl into a permanent friend. Based on what has been written here so far, there is maybe 30 decisions like that out of over 1000 decisions. That is hardly close to everything.
- They happen if you have sex with the two girls during the span of a week
- Only if you meet both girls in the same room
- Result in a bad outcome only if the girl is not at least 75% love, 25% sub and 45% lesbian
When do i put a warning ?
And that's just one example of currently 7 harems including up to 5 of the 20 girls in the game (not even talking about other cases than showdowns and harems).
As for resetting a story line that would just be nightmarish.